FS#15324 — bhs4-18a/b-n56

Details
In order to improve stability, we will upgrade bhs4-18a/b-n56 in a newer version.
The upgrade will take place on Wednesday 14 March 2018 at 08:00 UTC (09:00 FR - 03:00 CA).
No impact to be expected, both Nexus will be upgraded one after the other.